Index ring for a machine tool



FIG. 1 is a front elevational view of an index ring for a machine tool embodying my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side elevational view thereof; and

FIG. 4 is a sectional view of FIG. 1 taken along line 4--4 and viewed in the direction of the arrows. 

The ornamental design for an index ring for a machine tool, as shown. 